Fibrous Composite Failure Criteria with Material Degradation for Finite Element Solvers

Abstract

A method and system for modeling fibrous composites. Initially, material properties are obtained for a model of a fibrous composite, where the model includes integration points and unit cells. For each integration point, composite level stresses and strains are determined based on the material properties, the composite level stresses and strains are decomposed into component level stresses and strains for the integration point, the component level stresses and strains are used to calculate failure quotients at the integration point, an appropriate material reduction model is applied at a component level based on the failure quotients to detect a component failure, the component failure is upscaled to determine updated material properties at a composite level, and the updated material properties are incorporated into the model. At this stage, a composite failure is detected based on the updated model.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims the benefit of U.S. Provisional Application No. 62 / 684,889, filed Jun. 14, 2018, which is hereby incorporated in its entirety by reference.BACKGROUND OF THE INVENTION1. Field of the Invention[0002]The present invention relates generally to methods and systems for applying fibrous composite failure criteria with material degradation to finite element solvers.2. Description of the Related Art[0003]In recent years, two prominent investigations into the characterization and prediction of composite failure, the World-Wide Failure Exercise I and II, have been initiated and completed in 2004 and 2013. The investigations explore the effectiveness and utility of many different composite failure theories against many sets of experimental data. The World-Wide Failure Exercise (WWFE) was prompted mostly because many theories have been put forth to understand the ultimate strength of composites. Most of these theories begin fro...

AI Technical Summary

Benefits of technology

[0005]Embodiments in accordance with the invention relate to modeling fibrous composites. Initially, material properties are obtained for a model of a fibrous composite, where the model includes integration points and unit cells. For each integration point, composite level stresses and strains are determined based on the material properties, the composite level stresses and strains are decomposed into component level stresses and strains for the integration point, the component level stresses and strains are used to calculate failure quotients at the integration point, an appropriate material reduction model is applied at a component level based on the failure quotients to detect a component failure, the component failure is upscaled to determine updated material properties at a composite level, and the updated material properties are incorporated into the model. At this stage, a composite failure is detected based on the updated model.

Problems solved by technology

At this stage, a composite failure is detected based on the updated model.

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